The clean drugs will kill you eventually, the street drugs will kill you today.

The most common way people die of heroin/opiate overdose happens when they have reduced/stopped their consumption for a while and then something happens in their lives that makes them go back to it. On the first time they use it again, they overdose because they have lost some of their tolerance.

This very common path to overdose will happen whether the drug was pure or not. The root cause is that there is fairly narrow band of dosage in which you get high but don't stop breathing altogether.

Providing pharma grade hard drugs isn't the panacea that some people believe. Nuance is necessary. I haven't even touched on the very real downsides of living next to a clinic that provides services for people addicted to drugs.